Method and device for multi-cell channel estimation based on reference signal

A reference signal and channel estimation technology, applied in the direction of multi-frequency code system, baseband system components, etc., can solve the problems of cell channel performance degradation, etc., and achieve the effect of reducing computational complexity, dimensionality, and complexity

Active Publication Date: 2017-08-01
RDA CHONGQING MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a general multi-cell networking scenario, when there are differences in the signal arrival times of each cell, the performance of cell channel estimation will be significantly degraded.

Method used

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  • Method and device for multi-cell channel estimation based on reference signal
  • Method and device for multi-cell channel estimation based on reference signal
  • Method and device for multi-cell channel estimation based on reference signal

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Experimental program
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Embodiment 1

[0085] see image 3 , an embodiment of a reference signal-based multi-cell channel estimation method provided by an embodiment of the present invention may include:

[0086] S31, estimating the timing delay difference between the interfering cell and the local cell, and obtaining the timing delay difference di;

[0087] S32. Generate a local reference signal of each cell, and perform phase compensation on the local reference signal by using the timing delay difference;

[0088] Specifically, the phase compensation performed on the local reference signal is as follows:

[0089]

[0090] in, Denotes the local reference signal RS of cell i after phase compensation, S i (k) represents the local reference signal RS symbol at position k in the frequency domain, d i is the timing delay difference between the cell and cell i estimated in step S31, L represents the number of fast Fourier transform (FFT) transform points used during OFDM modulation, and j is the unit imaginary r...

Embodiment 2

[0118] Specifically, in step S33, the determination of the S and R signal vectors is related to the channel correlation bandwidth. Therefore, another embodiment of a multi-cell channel estimation method based on a reference signal provided by an embodiment of the present invention further includes, before performing multi-cell joint channel estimation and obtaining channel response values ​​at reference signal positions of the own cell and the interfering cell, Perform channel correlation bandwidth estimation, use the channel correlation bandwidth estimation to obtain the relevant bandwidth range, and obtain the phase-compensated reference signal within the relevant bandwidth range, refer to Image 6 , including the following steps:

[0119] S31, estimating the timing delay difference between the interfering cell and the local cell, and obtaining the timing delay difference;

[0120] S32. Generate a local reference signal of each cell, and use the timing delay difference to o...

Embodiment 3

[0148] see Figure 8 , the reference signal-based multi-cell channel estimation device provided by the embodiment of the present invention includes:

[0149] The timing delay difference acquisition module 81 is used to estimate the timing delay difference between the interfering cell and the own cell, and obtain the timing delay difference;

[0150] A phase compensation module 82, configured to generate a local reference signal of each cell, and use the timing delay difference to perform phase compensation on the local reference signal;

[0151] The channel estimation module 83 is configured to use the phase-compensated local reference signal to perform multi-cell joint channel estimation, and obtain channel response values ​​at the reference signal positions of the local cell and the interfering cell.

[0152] As can be seen from the above, in this embodiment, the timing delay difference between different cells arriving at the receiver signal is considered, and the phase com...

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Abstract

The embodiment of the present invention discloses a multi-cell channel estimation method and device based on reference signals, which are used to introduce phase compensation processing for the timing delay difference of different cells when constructing local reference signals, and then perform channel estimation to improve channel Estimated performance. The method in the embodiment of the present invention includes: estimating the timing delay difference between the interfering cell and the own cell, obtaining the timing delay difference; generating local reference signals of each cell, and using the timing delay difference to phase the local reference signal Compensation: use the local reference signal after phase compensation to perform multi-cell joint channel estimation, and obtain the channel response value at the position of the reference signal of the local cell and the interfering cell.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a method and device for channel estimation of multiple cells based on reference signals. Background technique [0002] In the Long Term Evolution (LTE) system, Orthogonal Frequency Division Multiplexing (OFDM) is adopted as its physical layer core technology, which distributes data on multiple orthogonal subcarriers for transmission. , the subcarriers can overlap on the spectrum, which greatly improves the spectrum utilization. [0003] In an OFDM system, the allocatable physical resources that carry information include time and frequency, usually using figure 1 The resource grid shown in the description is described. The resource grid is divided into different OFDM symbols in the direction of the time axis, and divided into different subcarriers in the direction of the frequency axis. figure 1 Each small cell in corresponds to the frequency of a subcarrier and the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 陈苗冯乔谭舒
Owner RDA CHONGQING MICROELECTRONICS TECH CO LTD
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